People
The safest road to Hell is the gradual one--the gentle slope, soft underfoot, without sudden turnings, without milestones, without signposts.
— C.S. Lewis · The Screwtape Letters

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Lewis describes moral decline as something quiet and almost pleasant rather than dramatic, a slow, comfortable descent instead of one big obvious wrong turn. Without sharp warnings or landmarks along the way, someone could drift downward gradually and never notice they'd gone anywhere at all.
Context reviewed